Pipe-wrench.



R. 0. DOHM.

PIPE WRENCH. APPLICATION FILED JULY 7, 1919..

Patented Dc. 6, 1910.

TINTT ROBERT O. DOHM, OF DANE, WISCONSIN.

PIPE-WRENCH.

arenas.

Specification of Letters Patent.

Patented Dec. 6, 1910.

Application filed July 7, 1910. Serial No. 570,898.

T 0 all whom it may concern:

Be it known that 1, ROBERT O. DOHM, cit1- zen of the United States,residing at Dane, in the county of Dane and State of llVisconsin, haveinvented certain new and useful Improvements in Pipe -Wrenches, of whichthe following is a specification.

This invention com-prehends certain new and useful improvements in pipewrenches, and relates particularly to improvements 1n that type ofwrench embodied in my copending application for Letters Patent of theUnited States filed October 15, 1909, Se rial No. 522,827, allowedFebruary 12, 1910.

The present invention has for its primary object an improvedconstruction of wrench of this type embodying improved means foryieldingly holding the relatively movable jaw in place after it has beenadjusted, and the invention consists in certain constructions,arrangements and combinations of the parts that I shall hereinafterfully describe and claim.

For a full understanding of the invention, reference is to be had to thefollowing description and accompanying drawing in which:

Figure 1 is a side elevation of my improved wrench, parts being shown insection; Fig. 2 is a transverse sectional view thereof; Fig. 3 is adetail perspective view of a spring held lever employed; and, Fig. 1 isa detail view of the spring of said lever.

Corresponding and like parts are referred to in the followingdescription and indicated in all the views of the accompanying drawingsby the same reference characters.

My improved wrench embodies a head which is composed of laterally spacedplates lto which the toothed relatively stationary jaw 2 is connected. Ahandle 3 is fulcrumed between the rear ends of the plates 1, asindicated at 1, the handle being formed with an angularly disposedforward end 5 adapted to engage the rear edge of the shank 6 of therelatively movable jaw 7. The shank 6 extends substantially at rightangles to the jaw 7, and is mounted for adjustable movement in the spacebetween the rear ends of the plates 1 and between the'jaws 2 and theangularly disposed end 5 of the handle 3. The shank is toothed on itsfront edge as indicated at 8 and is designed for engage ment by one ormore teeth 9 formed in the head, as clearly illustrated in the drawing.

A pin 10 is secured to the plates linear the edges thereof, said platesextending transversely as shown, underneath the handle 3 and beingdesigned to support a lever 11, which is formed with apertured ears 12by which it is fulcrumed intermediate of its ends on said pin. A spring13 is coiled around the pin 10, said spring embodying an lntermediateportion which bears against the rear end of the lever and hooked ends 14that are engaged with the side plates 1, the spring thereby holding thelever under tension with its forward end pressing forwardly against therear side of the shank 6.

From the foregoing description in connection with the accompanyingdrawing, the operation of my improved wrench will be apparent. In orderto adjust the jaws, the operator may, by pressing his thumb on the rearend of the lever 11 rock said lever in a direction to carry its frontend away from the shank 6 and the jaw 7 may then be moved nearer to orfarther away from the jaw 2, so as to effect the required adjustment ofthe parts. Upon releasing the lever 11, the spring 13 will be permittedto act so as to press against the rear side of the shank 6, the shankbeing thereby firmly held in engagement with the teeth 9 of the head. Bymanipulating the handle 3, it is obvious that the movable aw will belocked tightly 1nto engagement with the work, and upon releasing thepressure on the handle, the movable jaw will be permitted to rock and afresh hold obtained, the wrench being thereby operated as a ratchetwrench.

Having thus described the invention, what is claimed as new is:

1. A wrench of the character described, comprising a head having anopening extending therethrough, and a jaw in advance of said opening, ahandle fulcrumed in the head at the rear of said opening, a movable jawprovided with an angularly disposed shank fitting in said opening, andtoothed on its front edge, the first named jaw being toothed to engagethe teeth of the shank and the shank being arranged for engagement byone arm of said handle, and a spring pressed lever fulcrumed on thehead, one arm of said lever engaging the rear edge of the shank.

2. A wrench of the character described, having an opening extendingtherethrough and a jaw in advance of said opening, the jaw beingprovided with a tooth extending into said opening, a handle fulcrumed inthe head at the rear of said opening, a

movable jaw provided with an angularly disposed shank fitting in saidopening and toothed to enga e the teeth of the jaw, a pin secured to thehead in the rear of the shank, a lever fulcrumed on said pin to engagethe rear edge of the shank, and a spring bearing against the lever andthe head and arranged to press one end of the lever into engagement withthe shank.

3. A wrench of the character described, comprising a head having anopening extending therethrough, and a jaw in advance of said opening,the jaw being provided with teeth extending into the opening, a handlefulcrumed in the head in the rear of said opening a movable jaw providedwith an angularly disposed shank fitting in said engage the teeth of thefirst named jaw,

said shank being arranged for engagement by one arm of said handle, atransversely extending pin secured to the head, a lever formedintermediate of its end with apertured ears by which it is fulcrumed onsaid pin, and a spring secured to said pin, and having an intermediateportion bearing against the lever in a direction to rock the same intoengagement with the shank, the ends of said spring engaging the head.

In testimony whereof, I aflix my signature in presence of two witnesses.

ROBERT O. DOHM. [1,. s] Witnesses:

PETER BENZMILLER, Y J. B. MCOI-IESNEY.

